New Technology for Hoist Conveyance Monitoring and Wire Rope Analysis

CIM Vancouver 2002
Michael J. Beus, Marc Ruest,
Abstract Many mines in Canada, the US and S. Africa are reaching the hoisting limit. Very little payload will be possible due the excessive weight of the rope. It has been suggested that one of the most advantageous methods to increase payload is to reduce the safety factor. (DeLorme, G., 2000) Researchers at the Spokane Research Lab are developing new technology to improve hoisting safety and productivity. A patented Conveyance Monitoring System(CMS) determines hoist rope endload. This information is transmitted to the hoist operator 20 times per second. Recent field measurements on 1 ¾” dia. hoist rope indicate that dynamic forces during loading of a 10 ton skip attained a peak level nearly 75 % above the existing payload. To improve on the current understanding of the mechanical behavior of hoist ropes and to help interpret the results from field testing the CMS, numerical modeling of stranded rope is being conducted. Particle Flow Code, PFC3D (Itasca 1995b) is used to simulate the structural behavior of wire rope and the interaction between individual strands when the rope is subjected to static and dynamic end loading. Details of the CMS, field results from the measured rope loads, and the results of numerical modeling or the wire rope will be discussed.
Keywords: Shaft, Monitoring, Conveyance, Wirerope
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